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Here's a list of terms you may encounter as you learn Adobe Photoshop® – from BDM Publications . Active layer The layer currently selected in the Layers panel Adjustment layer A layer that lets you apply colour and tonal adjustments to your image without permanently changing pixel values. Use adjustment layers to experiment with colour and colour tones. You can think of an adjustment layer as a veil through which the underlying layers are seen. Adobe RGB The RGB colour space profile created by Adobe Systems, Incorporated. It provides a large gamut of colours. Aliasing The jagged edges seen at the edges of diagonal lines, arcs, and so on, caused by pixels lining up in a saw-tooth pattern. Alpha channels Masks, which let you manipulate, isolate, and protect specific parts of an image. In Photoshop, alpha channels are called saved selections. To save an alpha channel, choose Select > Save Selection. To load an alpha channel, choose Select > Load Selection. Anti-aliasing The smoo...